Lug Nut Size Chart: Matching Sockets to Lug Nuts

Lug nut size: where the number comes from

The size is the width across the flat sides of the nut, and it is the same number stamped or etched on the socket that fits it. Metric nuts are measured in millimeters, and SAE nuts are measured in fractions of an inch, so the 2 systems never share a number. The vehicle manual lists the size for the car, and the socket set lists the sizes it holds, so the job is to match the 2 lists before the wheel comes off.

Lug nut size chart: metric and SAE

The 4 sets here cover 17, 19, 21 and 22 mm in metric, and 3/4, 13/16, 7/8 and 15/16 inch in SAE. The OMT listing calls 17, 19 and 21 mm plus 13/16 and 7/8 inch the 5 most commonly used sizes. Only the VEVOR set carries all 8 sizes, with a 3 inch extension bar on top, so it is the set to reach for when the size is unknown.

How to match a socket to a lug nut

1. Read the marking. Each socket carries its size in markings, laser-etched on the WORKPRO and OMT sets, stamped on the TUZkozs set, and high-contrast on the VEVOR set, and the WORKPRO and VEVOR sets add color coding so the size is easy to spot in a dim garage.
2. Check the drive. All 4 sets here are 1/2 inch drive, and the WORKPRO listing notes they work with 1/2 inch drive torque wrenches.
3. Slide the socket on by hand. The right socket slips on snug with no wobble. If it rocks or spins, it is the wrong size, so try the next size up or down rather than forcing it.
4. Use a deep socket for long studs. Deep wells handle long fasteners, and the VEVOR set adds a 3 inch extension bar for reach.
5. Tighten with a torque wrench. Snug the nuts by hand, lower the car, then finish with a torque wrench to the figure in the vehicle manual.

Socket sets that cover these lug nut sizes

These 4 sets cover the sizes in the chart above, from the 5 most common sizes to the full metric and SAE range, and each card below states what part of the sizing job it handles.

These are scored on the Shop Score, which weighs performance, build, and value most, with safety where it applies, and warranty. None of the 4 sets states a safety certification, so all 4 score 0 for safety, and only the OMT set states a warranty term, a 1 YEAR warranty.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

For the tools around the job, see the best torque wrench and the best impact wrench.

Common mistakes

• Using the wrong size socket. A loose socket rounds the corners of the nut, and a rounded nut is a long job to remove. Read the marking and check the fit by hand first.
• Forcing a metric socket onto an SAE nut. The sets list metric and SAE sizes separately, and only the VEVOR set carries the full range, so keep the systems apart.
• Using a standard socket on an impact wrench. All 4 sets here are impact duty Cr-Mo sockets. A standard chrome socket is not built for impact use, so keep it on the ratchet.
• Skipping the torque wrench. An impact wrench spins nuts on fast, but the final tightening belongs to a torque wrench set to the figure in the vehicle manual.
• Forgetting the extension bar. Deep wells and long studs need reach, and only the VEVOR set includes a 3 inch extension bar.

FAQ: garage tools

Which lug nut sizes show up most often?

The OMT listing calls 17, 19 and 21 mm plus 13/16 and 7/8 inch the 5 most commonly used sizes. Between them, the 4 sets cover those 5 sizes, and the VEVOR set adds 22 mm, 3/4 inch and 15/16 inch on top. Check the vehicle manual for the size on the car.

How can you check the lug nut size?

Read the size off the socket that fits: each socket in these sets carries size markings, laser-etched on the WORKPRO and OMT sets, stamped on the TUZkozs set, and high-contrast on the VEVOR set, and the WORKPRO and VEVOR sets add color coding. The vehicle manual also lists the size. Slide the socket on by hand first: the right one slips on snug with no wobble.

Are SAE and metric lug nut sizes interchangeable?

No. The sets list metric sizes in millimeters and SAE sizes in fractions of an inch, and each nut needs its own socket. The VEVOR set carries the full range of metric and SAE sizes in the same case, so each nut gets the socket made for it. Do not force a metric socket onto an SAE nut or the other way around.

What drive size do lug nut sockets use?

All 4 sets here are 1/2 inch drive. The WORKPRO listing notes they work with 1/2 inch drive torque wrenches, which is the drive size for the final tightening step.

Are deep sockets needed for lug nuts?

Deep wells help where the studs are long. The OMT and TUZkozs listings call out deep wells for long fasteners, the WORKPRO set is a deep thin-wall set, and the VEVOR set adds a 3 inch extension bar for reach. Check the stud length on the car to confirm a deep socket fits.

Why do these sockets have protective sleeves?

The sleeves and covers keep the socket from marking the wheel. WORKPRO lists removable protective sleeves with an inner white plastic insert, OMT lists colored protective covers, and TUZkozs lists a 360-degree scratch-resistant cover with internal inserts. The WORKPRO sleeves and the TUZkozs cover come off where the wheel well is too tight for them.

Related: the best lug nut socket set, the best lug nut tool for tire changes, the best jack stands and the best wheel chocks. Also see impact socket vs standard socket, analog vs digital torque wrench and the engine and shop equipment hub.